frontend/src/components/ocr/DocumentPreview.jsx

import React from "react";
import { motion } from "framer-motion";
import { FileText, ZoomIn, ZoomOut, RotateCw, Maximize2 } from "lucide-react";
import { Button } from "@/components/ui/button";

export default function DocumentPreview({ file, isProcessing }) {
  // Mock preview - in real app would show actual document
  const mockPages = [1, 2, 3];

  return (
    <div className="h-full flex flex-col bg-white rounded-2xl border border-slate-200 overflow-hidden">
      {/* Header */}
      <div className="flex items-center justify-between px-5 py-4 border-b border-slate-100">
        <div className="flex items-center gap-3">
          <div className="h-8 w-8 rounded-lg bg-indigo-50 flex items-center justify-center">
            <FileText className="h-4 w-4 text-indigo-600" />
          </div>
          <div>
            <h3 className="font-semibold text-slate-800 text-sm">Document Preview</h3>
            <p className="text-xs text-slate-400">{file?.name || "No file selected"}</p>
          </div>
        </div>

        {file && (
          <div className="flex items-center gap-1">
            <Button
              variant="ghost"
              size="icon"
              className="h-8 w-8 text-slate-400 hover:text-slate-600"
            >
              <ZoomOut className="h-4 w-4" />
            </Button>
            <span className="text-xs text-slate-500 w-12 text-center">100%</span>
            <Button
              variant="ghost"
              size="icon"
              className="h-8 w-8 text-slate-400 hover:text-slate-600"
            >
              <ZoomIn className="h-4 w-4" />
            </Button>
            <div className="w-px h-4 bg-slate-200 mx-2" />
            <Button
              variant="ghost"
              size="icon"
              className="h-8 w-8 text-slate-400 hover:text-slate-600"
            >
              <RotateCw className="h-4 w-4" />
            </Button>
            <Button
              variant="ghost"
              size="icon"
              className="h-8 w-8 text-slate-400 hover:text-slate-600"
            >
              <Maximize2 className="h-4 w-4" />
            </Button>
          </div>
        )}
      </div>

      {/* Preview Area */}
      <div className="flex-1 p-6 bg-slate-50/50 overflow-auto">
        {!file ? (
          <div className="h-full flex items-center justify-center">
            <div className="text-center">
              <div className="h-20 w-20 mx-auto rounded-2xl bg-slate-100 flex items-center justify-center mb-4">
                <FileText className="h-10 w-10 text-slate-300" />
              </div>
              <p className="text-slate-400 text-sm">Upload a document to preview</p>
            </div>
          </div>
        ) : (
          <div className="space-y-4">
            {mockPages.map((page, index) => (
              <motion.div
                key={page}
                initial={{ opacity: 0, y: 20 }}
                animate={{ opacity: 1, y: 0 }}
                transition={{ delay: index * 0.1 }}
                className="relative bg-white rounded-xl shadow-sm border border-slate-200 aspect-[8.5/11] overflow-hidden"
              >
                {/* Mock document content */}
                <div className="absolute inset-0 p-8">
                  {/* Header simulation */}
                  <div className="flex items-center gap-4 mb-8">
                    <div className="h-12 w-12 rounded-lg bg-slate-100" />
                    <div className="space-y-2">
                      <div className="h-3 w-32 bg-slate-100 rounded" />
                      <div className="h-2 w-24 bg-slate-50 rounded" />
                    </div>
                  </div>

                  {/* Text lines simulation */}
                  <div className="space-y-3">
                    {[...Array(12)].map((_, i) => (
                      <div
                        key={i}
                        className="h-2 bg-slate-100 rounded"
                        style={{ width: `${Math.random() * 40 + 60}%` }}
                      />
                    ))}
                  </div>

                  {/* Table simulation */}
                  <div className="mt-6 border border-slate-100 rounded-lg overflow-hidden">
                    {[...Array(4)].map((_, i) => (
                      <div key={i} className="flex border-b border-slate-50 last:border-0">
                        {[...Array(3)].map((_, j) => (
                          <div
                            key={j}
                            className="flex-1 p-3 border-r border-slate-50 last:border-0"
                          >
                            <div className="h-2 bg-slate-100 rounded w-3/4" />
                          </div>
                        ))}
                      </div>
                    ))}
                  </div>
                </div>

                {/* Processing overlay */}
                {isProcessing && (
                  <motion.div
                    initial={{ opacity: 0 }}
                    animate={{ opacity: 1 }}
                    className="absolute inset-0 bg-indigo-600/5 backdrop-blur-[1px]"
                  >
                    <motion.div
                      initial={{ top: 0 }}
                      animate={{ top: "100%" }}
                      transition={{
                        duration: 2,
                        repeat: Infinity,
                        ease: "linear",
                      }}
                      className="absolute left-0 right-0 h-1 bg-gradient-to-r from-transparent via-indigo-500 to-transparent"
                    />
                  </motion.div>
                )}

                {/* Page number */}
                <div className="absolute bottom-3 right-3 text-xs text-slate-400 bg-white/90 px-2 py-1 rounded">
                  Page {page}
                </div>
              </motion.div>
            ))}
          </div>
        )}
      </div>
    </div>
  );
}